Romain Michon 250B

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First Ideas for the Final Project (01/27/2013)

Global View


The idea is to create a space where several static microphones (4 ?) would pick-up the sound happening in the room and would send their signal to a structure that would act as a sound processor. The processed sound would be then played back with speakers.

The structure I'm thinking about is an open cube made of a metal frame where many springs would be stretched at different positions. One extremity of every springs would be fasten to a transducer and the other extremity to a piezo. The idea would be that the sound produced by the transducer would be carried to the piezo by the spring that would modify the spectral content of the sound.

The signal from the microphones could be first received by a multi-channels audio interface connected to a small computer (BeagleBoard?) that would route the signal to one spring or another. It would also be interesting to process the sound on the computer and to associate a specific sound effect to each spring. A kinect could be used to detect the position of a person in the installation space and could control to which spring the sound would be sent. Finally, we could use a 4 channels playback system that would allow to spatialize the sound around the cube.

The Cube Frame


The cube's frame would be based on a structure made of square metal bars. Its dimension has yet to be defined but it will depend on the maximum stretching length of the springs. As it is shown on the sketch above, one single metal bar can be used to build the cube structure. It will be cutted and then soldered. Another important thing to define is the width of the metal bars.

Transducer/Spring/Piezo System

One of the most important factor to take into account for the design of the system that will hold the spring streched is that the spring should apply as less pressure as possible on the piezo. Also, as it wont be possible to totaly hide the transducers in the cube structure (too big), we have to think about a nice way to integrate them in the installation.


Based on the constraints mentionned above, the best think I came with looks like that:



The soft cords isolate the springs from the rest of the structure which is important if we wanna keep them independant. Although, it might also be interesting to use metal wires instead in order to create more interactions between the different elements of the structure... The piezo is glued on a small piece of metal that holds the spring.


In order to see how well a spring behave when it is used to process sound, I did the following test:


Global view of the experiment.

Test1 piezo2spring 250b.jpg

Tranducer to spring.

Test1 spring2piezo 250b.jpg

Spring to piezo. The piezo is glued on the other side of the metal plate.

To test the system, the sound of a youtube video of The Little Prince was played in the spring. The result was recorded and is available here.

Additional Features and Thoughts

I think the most interesting part of this installation is that it creates some kind of "mise-en-abîme": the sounds of the room are processed in the cube which acts as a smaller room with its own acoustical properties.

Touching and moving the springs when a sound is played in it provides a great control on the nature of the generated sound: the audience should be able to easily access the springs to touch them.

Adding some vibrators to shake the cube could create intersting effects.

The graphical aspect of the installation is very important: LEDs could be added.

Narrowing Down... (01/30/2013)

Bars base 250b.jpg

Bars welding 250b.jpg

Raw cube side 250b.jpg


Raw cube in 250b.jpg

Cube max 250b.jpg

Cube interface 250b.jpg